# A002575 (b-file synthesized from sequence entry)
2 1
3 3
4 9
5 35
6 201
7 1827
8 27337
9 692003
10 30251721
11 2320518947
12 316359580361
13 77477180493603
14 34394869942983369
15 27893897106768940835
16 41603705003444309596873
17 114788185359199234852802339
18 588880400923055731115178072777